Dear colleagues,
More of the same...
Pleade note that if the anser to #3 in my original message is positive, then
the statement in the draft that say the Replication Segment is similar to the
Binding segment srems to be inaccurate.
My 2c.
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________________________________
From: Alexander Vainshtein <[email protected]>
Sent: Tuesday, October 15, 2019, 16:30
To: [email protected]; [email protected]; [email protected];
[email protected]; [email protected]
Cc: [email protected]
Subject: Some questions regarding Replication SID
Dear colleagues,
I have read the Replication SID
draft<https://tools.ietf.org/html/draft-voyer-spring-sr-replication-segment-00>,
and I have a few questions dealing with possible instantiation of the
Replication SOD in
SR-MPLS<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-22>.
1. The draft says that “each branch is abstracted to a <Downstream Node,
Downstream Replication-SID>”. Does that mean that the Downstream
Replication-SID is one of the SIDs defined in Sections 3, 4 and 5 of
RFC8402<https://tools.ietf.org/html/rfc8402>?
2. The draft also says that “A Replication branch to a particular
Downstream Node could be represented by the node's Node SID”. Does this mean
that the Replication Node sends the packets it receives with the Replication
SID as the active segment with the labels representing the downstream Node SID
as the active segment across such a replication branch?
3. The draft also says that “Replication segment is instantiated at
Downstream nodes and at the Replication node”. Does that mean that the list of
SIDs associated with the specific replication Branch is pushed by the
Replication Node on top of the label representing the Replication SID in the
Downstream node of this branch?
4. Are the labels that represent the Replication SID at the Downstream nodes
downstream-allocated by these nodes or upstream-allocated by the replication
node?
5. The draft also says that “A Replication segment can be either
provisioned locally on a node or programmed by a PCE”. These two options look
exactly the same to me from the POV of the node on which the Replication
segment is programmed - what, if anything, did I miss?
6. Did you consider a possibility of advertising the Replication Segment
from the Downstream nodes to the Replication one using some multicast routing
protocol (e.g., creating a SR-MPLS replacement for mLDP)? Or is such a
possibility strictly precluded?
Any details regarding instantiation of the Replication Segment in SR-MPLS would
be highly appreciated.
Regards, and lots of thanks in advance,
Sasha
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Email: [email protected]
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